Activity monitor



FIG. 1 is a front, top, and right side perspective view of an activity monitor showing our new design;

FIG. 2 is a rear, bottom, and left side perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a right side view thereof; and,

FIG. 8 is a left side view thereof.

The oblique lines in FIGS. 1-4 and 6-8 indicate translucency. 

CLAIM The ornamental design for an activity monitor, as shown and described. 